Pipe-wrench.



No. 810,096. PATENTED JAN. 16, 1906.

J. H. VINTON.

PIPE WRENCH.

APPLICATION FILED JAILZI 1905.

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@476 259770. vile-(1mm.

UNITED STATES PATENT oFFIoE.

JOHN H. VINTON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO LOUIS O. SMITH, OFWINTHROP, MASSACHUSETTS.

PIPE-WRENCH.

Patented Jan. 16, 1906.

Application filed January 24, 1905. Serial No. 242,466.

To aZZ whom, it may concern:

Be it known that I, JOHN H. VINTON, a citizen of the United States,residing in Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in PipeWrenches, ofwhich the following is a specification.

This invention relates particularly to pipewrenches adapted forcomparatively light worksuch, for example, as is required in the care ofautomobiles; but I propose to employ it in any connection and either inlight or heavy work.

The nature of the invention is fully described below and illustrated inthe accompanying drawings, in which Figure 1 is a side elevation of myimproved wrench. Fig. 2 is a side elevation of the same, the outer orcovering portion of the movable jaw being illustrated in longitudinalvertical section. Fig. 3 is a perspective view of the outer or coveringportion of the movable jaw removed. Fig. 4 is a cross-section taken online 4 4, Fig. 1. In Figs. 1 and 2 a large portion ofthe bar is brokenout.

Similar letters of reference indicate corresponding parts.

a represents the stationary jaw made integral with the bar or handle 6.The inner or engaging face 0 of this j aw is at a slightly obtuse anglewith the bar and is provided with inwardly-engaging teeth--that is,teeth point ing toward the bar I). The under or inner edge of the bar isprovided with rack-teeth d.

The movable jaw comprises the main or working portion 6, made,preferably, of cast tool-steel and having its engaging face 9 at anangle which is opposite to the angle of the face 0 of the stationary jawwhen said jaws are in their normal position, as illustrated in Figs. 1and 2. Thus the faces of the two jaws flare or produce a flaringopening, the faces being on divergent lines like the lines of a frustum.The engaging face g is provided with teeth pointing in the oppositedirection from the teeth. on the face 0. This working or main portion ais embraced by a covering or yoke h, preferably of sheet-steel,consisting of two folds which unite at the upper edges and embrace thebar 5, thus connecting the movable jaws slidingly with the bar. Thiscovering or yoke conforms to the shape of the portion 6, completelycovering its sides with the exception of a small portion next the faceof the jaw, and the two portions 6 and h constitute the movable jaw.Moreover, the working portion 6 completely fills the flanking portion ofthe covering or yoke with the exception of the small chambers left forthe spring and worm, below described, thus providing a maximum of stockand strength for its position. The parts 9 and c are united by suitablebolts or rivets 7c.

In a vertical recess Z in the part c of the movable jaw is set a springm, which surrounds a pin it and lies between the head p of said pin andthe bottom of the recess, whereby the inner or engaging end of themovable jaw is held normally away at a slight angle from the bar I), asshown.

In a horizontal recess 1 in the portion 0 is located ahorizontally-disposed nut consisting of the cylindrical portion 8, wormt, and shoulder bearings or trunnions a. Moreover, the cylindricalportion is provided centrally with an annular groove 1). The nuthas itsbearings in the portion e, its cylindrical portion is in diameter ofabout the thickness of the portion 6, and its thread or worm extendsbeyond the covering h and is suitably serrated or roughened, saidcovering or yoke being provided with openings w on the opposite sides,registering with the recess 1". From the upper edges of the openings wdownward extensions y enter the annular groove 1; and bear against theopposite sides of the nut within the groove, thus holding up the nutwith its worm in engagement with the rack when the movable jaw e andyoke h, secured thereto, are swung down.

The nut which carries the worm is solid and of an integral piece, no pinbeing employed, and is held in place by the heavy shoulder bearings ortrunnions u, whereby the said nut is rendered exceedingly strong and notliable to become broken. In assembling the parts it is dropped intoposition beforethe covering or yoke is applied, and as the trunnionsoccupy practically-all the space between the two parts of said yokeshaking or rattling is prevented.

In operation when the wrench is applied to a pipe and the movable jawpressed against it the oppositely-projecting teeth on the faces 0 and ggrip firmly the opposite sides of the pipe, and as the bar I) isoperated the face 9 of the movable jaw moves a little inward toward thebar and its outer end of course nions-integral with the nut held inplace in swings a little toward the face of the stationary jaw, wherebythe angle of the face 9 is moved toward a right angle, reducing theflare of the opening, thus obtaining an exceedingly firm and powerfulhold on the pipe. Of course when the movable jaw is thus moved againstthe power of the spring m, it swings from a pivotal point near its rearend, the two parts 0 and h swinging together. In practice when the pipeis inserted between the jaws it is not pushed between them as far as itwill go so as to touch the bar I) in order to give the movable jaw anopportunity for the inward movement above described. Should the movablejaw bring up against the bar, the bar operates as a stop and checks itsfurther movement, thus preventing it from crushing the pipe. Theextensions y operate in the well-known mechanical manner in connectionwith the worm to move the face 9 toward the face 6. 7

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

v 1. In a wrench of the character described, a bar or shank providedwith rack-teeth on its under side and a stationary jaw integraltherewith; a movable jaw comprising the yoke or covering h and the solidworking por: tion 6 substantially filling said yoke or covering; and asolid nut provided with a worm engaging the rack-teeth and havingtrunthe portion a by said covering h, substantially as set forth.

2. In a wrench of the character described,

a bar or shank provided with teeth on its under side, and a stationaryjaw integral therewith; a movable jaw comprising the main or "workingportion 6, and the yoke or covering h rigidly secured to the mainportion and loosely embracing the said shank whereby the movable jaw canswing with relation to the shank; and a solid nut provided with a wormengaging the teeth and supported by said yoke or covering, substantiallyas set forth.

3. In a wrench of the character described, a bar or shank provided withrack-teeth on its under side and a stationary jaw integral therewith; amovable jaw comprising the yoke or covering h provided with the oppositeopenings w and with integral extensions 41 projecting into saidopenings, and a solid inserted working portion e provided with a recesssubstantially registering with and between said openings; and a nutprovided with a suitable worm and having an annular groove 1) in itscylindrical portion into which the said parts y extend, said extensions1 bearing against the opposite sides of the nut within the groove 12,and said nut being supported by the inserted portion e and with its wormextending through the opposite openings in the covering portion h, forthe purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN H. VINTON.

Witnesses:

HENRY W. WILLIAMS, A. K. Hoon.

